[HoneyHush]

I have a set of 17’s in my pile. I cc’d them a couple of years ago and I’m almost positive that they were close to 74/75 but have a little bit of valve sink I believe. I can cc them again if you want so you don’t have to pull the heads off? I wouldn’t anyway for a question of 2 or 3 cc’s lol.

[Jay S]

Lol, I have kind of found it is a little late to provide much helpful advise on engine internals once the heads are bolted on..

I think I underestimated the power potential of a small valve head some. I got to thinking I remember Dennis Jenson ( SD455DJ) posted some dyno pulls for a 400 with small valve heads a while back. Pure stock type built, tight quench, upper 70s cc small valve head with 45* valve, summit 2801, 214/224 @.050” cam, log manifolds. 383 HP @5300 and 455 tq@3500. You can see there would be no need to jump up to the bigger 224/234 cam. FWIW..Personally, most my experience has shown heads with 45* valves can usually tolerate more compression than the 30* intake heads, especially on smaller valve set ups. If KRE did 45* seats, it will help the XE some. Hopefully the engine has the bigger cc’s than in the 70s.

[llwta76]

Originally Posted by HoneyHush

I have a set of 17’s in my pile. I cc’d them a couple of years ago and I’m almost positive that they were close to 74/75 but have a little bit of valve sink I believe. I can cc them again if you want so you don’t have to pull the heads off? I wouldn’t anyway for a question of 2 or 3 cc’s lol.

Generous offer! Thanks a lot! This engine is buttoned up and still on a engine stand. As far as the cam goes I think it will be fine being only a street cruiser( after all torque is what moves a vehicle driven on the street anyway) . It's the c.r. that needs to be established. Numbers from 72-83.5 cc is just too much of a guessing game. If comp ratio is in the high 9's then the cam simply needs to go. I need to get back to him and advise. What he does is up to him. I will certainly strongly advise him to pull a head and get a chamber cc'd. then go from there.

Thanks for all the responses, Larry