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#1
03-05-2010, 03:11 AM
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Wrong or Right Need Expert 2 cents
Back in 94 i built my first pontiac motor it was a 72 455 block punched .030 with trw slugs,a set of what i was told then "48" ram air iii heads (i think they were off a 350),a ram air iv intake (with holley 800 db)(i still have)and i ordered a hc-03a cam:My total combo was:455 Short block with trws,hc-03a cam,crane anti-pumpup lifters,comps 995s & 1.5 rockers switching between the 48s and a set of 7m5s.Combo kicked but,then i put 150Nos on it... Cracked block and a 7m5 head,I got another block this one is .060,i have a new a cam,i've traded my comp rockers for harland 65s and heads i got another 7m5 my question is how can i reproduce my original power with little investment?Also did i chose anything wrong in my combo?BTW the cam specs @: 244/256......504,524 @1.5 Thanks for your 2 pennys
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#2
03-05-2010, 07:11 AM
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7M5 heads? Did you happen to cc them? I remember them having short valves and HUGE combustion chambers. They would make for a really LOW compression ratio engine. I'd opt for a set of heads around 87-95cc instead, especially with that much cam.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#3
03-05-2010, 11:00 AM
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Elongate the pushrod holes or you will have pushrod binding. If I understand the post correctly. you have a 455 again? I would find a set of 6X-4 with that cam and needing some 9.5-1 compression heads and install a set of SS 2.11/1.77 valves.
You don't want the 455 with RA III type 72 cc senerio heads unless you plan on running race gas all the time. Over 11.5-1 compression with an iron head. Ouch. It should fly. |
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