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#1
03-02-2017, 03:14 PM
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Flat top vs Dish in a V
Putting together an aluminum RA-V top end package and need some opinions.
Got a set of custom BRC pistons in this engine with a 15cc dish running #48 heads at around 9.8:1, pulling off the 48's for the V's. Running a 4" stroke in this 433, but if my memory is right we used either Eagle 6.535 or 6.635 BBC rods since the pistons were customs anyway. I'd have to pull it down to know for sure which length we went with. These V heads come cast with a 78 cc chamber, I'd need to mill them to around 65 cc to utilize the dished piston and be about 10.8:1 Is popping for another set of custom pin ht flat tops worth it? Any idea what the gains or losses would be between the two options? I'd think the 1.6 Rod-Stroke ratio would be ok with the port volume of the V head in a street-strip engine that will rarely see 6000 rpms on regular cruises, but?
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#2
03-02-2017, 04:28 PM
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Pump gas? What is easier mill the heads or new pistons-which will also require rebalancing.
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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 |
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#3
03-02-2017, 05:02 PM
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Pump gas, so I figure 10.6-10.8 would be a good compression switching to Aluminum heads.
I'll have to swap the 4-6 and 3-5 pistons so the bottom end comes apart anyway.
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#4
03-02-2017, 10:10 PM
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Quote:
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#5
03-03-2017, 09:06 AM
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Quote:
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#6
03-03-2017, 03:34 PM
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Man I'd just get new pistons then get the CR just right and still have a thick deck on the heads for sealing. And if you get real technical put the heads om the block and pour the chamber for an exact match dish!
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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 Last edited by Skip Fix; 03-03-2017 at 03:48 PM. |
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#7
03-03-2017, 03:45 PM
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I would mill and get thin Cometics to get me around 10.3 or so.Tom
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#8
03-03-2017, 07:40 PM
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Valve relief orientation is going to be an issue regardless
D port = EIEEIE V head = EIEIEI
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74 Ventura 462/#13 heads/3350# 10.38 @ 128.89 MPH, N/A, Stock suspension, 275/60 Radial, Street legal, Tagged & Insured |
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#9
03-03-2017, 07:43 PM
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not a issue if you swap the 2 center pistons going from a std to a V head.Done it a few times.Tom
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#10
03-03-2017, 08:03 PM
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Quote:
I'm just in the same camp as Skip on this on... it is going to cost $$ either way.
__________________
74 Ventura 462/#13 heads/3350# 10.38 @ 128.89 MPH, N/A, Stock suspension, 275/60 Radial, Street legal, Tagged & Insured |
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