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#21
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i seen on the sm sight they are offering 78cc heads now, i wondered if its a typo for 87cc but i also see there 230cfm runners vs 215. think if the bare castings go on sale black friday i might snag a pair just for the helluvit
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#22
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They're offering CNC ported runners that have been flowed, around 300 cfm IIRC.
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#23
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I will probably get another set this year.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
#24
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I emailed Speedmaster. They confirmed after CNC the comb chamber they are 78 cc.
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#25
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I still have not measured my CNC ones. I did dig the burrette out to though.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#26
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the cnc ported head had a different chamber than the cnced standard offering 72cc? someone must have confirmed this in 12 months they have been available?
is 78 any better than 72? still cant use it on a 455 wo race gas or e85 i wouldn't think
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#27
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I'll try and do mine tomorrow.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#28
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75.5-76cc. Be sure to chase spark plug holes CNC was after and a little thin layer laid over
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following 2 Users Say Thank You to Skip Fix For This Useful Post: | ||
#29
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I run the sm and the e-heads with comp-ratio's @ 11.75-12.00.1 comp.
91 octane pump gas on all of mine with no issues, Race gas when spraying. GT |
The Following User Says Thank You to blueghoast For This Useful Post: | ||
#30
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What cam/ cubic inch?
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#31
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One is a 464 and the other is a 462
The 464 is 11.7 something and the 462 is 11.98.1 cams are simuliar Cam specs 630s-660s dur@50 273 int 278 ex 108 lsa and 274-278 106 lsa GT |
The Following User Says Thank You to blueghoast For This Useful Post: | ||
#32
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Quote:
The cam I will be running is an Ultradyne solid roller, Master Lobes R44/R41, 264/268 @ .050, 176/187 @ .200, .3944/.3944 Lobe Lift .592@1.5/.651@1.65, LSA 108
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Tim Corcoran Last edited by Tim Corcoran; 11-22-2023 at 06:04 AM. |
#33
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Quote:
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The Following User Says Thank You to slowbird For This Useful Post: | ||
#34
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My motor is 11.2:1 static CR with a cam similar to Tim's and I have run straight 93 pump and a 70/30 mixture of 93/110 octane without any signs of detonation. I've had the motor apart and the rod bearings were all good. It's not 12:1, but is a data point for reference.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#35
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I am curious how/why blueghost gets away with 12:1 on 91 octane. I'm not going to risk hurting my new engine by trying to push the limit. I think I'll stick to my original plan and mill the heads to get about 12.75:1 and continue to use 110 race gas. The engine I'm building is to replace the previous engine which I was using Sonoco 110 and that engine had 12.3:1. I will use the same cam as was in the previous engine but will put 1.65 rockers on the new build and the previous engine had 1.5's. The previous engine had valve to piston restrictions, but the new build will not.
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Tim Corcoran |
#36
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Quote:
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#37
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People sure like that E85 once they make the switch. The nice thing about it is converting your system/ carb over to it is not near the undertaking converting to straight alcohol is.
I wish it was available here without the 4 hour drive. |
#38
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Did your track close ? Sacramento?
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#39
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I know that alcohol is corrosive I am not sure about if 85% alcohol will corrode my fuel system or if I have to purge the system after every event like alcohol racers do. And I don't think we even have E-85 in my area. I would need to re-jet, larger squirters change timing, might even have to go with a colder plug. Seems like a lot of extra work to get an ideal tune. If they had E-85 in my area it might be worth the fuel savings. It's a thought but most likely I will stick with race gas I get it by the 55 gallon drum so that is convenient.
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Tim Corcoran |
#40
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Mine ?
Sacramento is done. Samoa Drag Strip (Eureka CA) is going strong. Trying to keep it 1/4 mile as Redding CA has went to the 1/8th. I think too many people watch Street Outlaws and want to go 1/8 mile! |
The Following User Says Thank You to Dragncar For This Useful Post: | ||
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