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#1
08-08-2008, 11:32 AM
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et improvment by changing heads only!!
hi guys! i thought it would be interesting what you other guys gained by changing heads only!-all other things remained the same !! carb & intake manifold change is allowed when also tested on the original combo!!
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#2
08-08-2008, 11:39 AM
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I have a bunch of info on a head change from a 308cfm E-head (88cc) to a set of out of the box (90cc), 360cfm at my .650 cam lift!!! CV-1's in my 76 T/A. Pump gas, hydraulic roller. It's located here. http://www.pontiaczone.com/forum/showthread.php?t=22196
You can sort thru all the negative crap and hassle then form your own opinions. I'm happy and not looking back.  Only change was the heads and worth .3/.4 depending on the weather conditions taken into account. Last edited by PONTIAC DUDE; 08-08-2008 at 12:25 PM. |
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#3
08-08-2008, 11:59 AM
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Do not forget, a head change also may dictate a compression change.
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#4
08-08-2008, 01:32 PM
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I picked up 75 RWHP with no changes except from 230ish ported 6x heads to 310 KRE D ports.
__________________
68 Firebird Are you running with the wind or breaking it? |
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#5
08-08-2008, 04:12 PM
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.5 second
#62 's to Edelbrock's = five tenths
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1969 Firebird, Tx3-455/468 machined by CVMS E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid 850DP on E-85 by Eric Niefert/T2 1" plastic spacer T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400 1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine) https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be 1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine) |
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#6
08-08-2008, 04:49 PM
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Went from a set of mildly ported 6-8Xs to out of the box KREs [260] cfm and picked up about one half second.
Jim
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65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8. |
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#7
08-08-2008, 05:25 PM
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I picked up 1 second and 10 mph going from a set of stock 51 heads to a set of ported 6x's. With no other changes.
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#8
08-08-2008, 07:53 PM
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Changed from 265 cfm #62 D-ports and a Warrior to High Ports and a Victor. Same carb, same cam, same exhaust system, but with round port headers. Compression went from 10.2:1 to 11.3:1 with the chamber size difference. Still on pump gas though.
Previous best - 11.45 @ 116 New best - 10.59 @ 124.5
__________________
Brian Rock '65 GTO - Pump gas 496" IA2 w/ High Ports, 200-4R trans, 3.73 gears, 275 Hoosier radials, and 3925 lbs. 9.88 @ 134 N/A on Cali 91 octane. http://www.youtube.com/watch?v=NJEIY5OJ68g 
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#9
08-10-2008, 12:47 PM
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I went from 12.10's to 11.50's changing from kre poted 248cfm #96's to 310 cfm kre d ports. solid flatt tappet cam at 3995lbs. this is a street car driven 140 miles to the track.
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#10
08-11-2008, 08:34 PM
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Changed from ported ram air 4's to ported E-heads. Went from a best of 6.58 in the 1/8th to a best so far of 6.10.
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