[Dannylmcguire]

Hey guys I have a 10066036 4 bolt main I got for free my brother in wants a motor so I thought I would build this for him are they worth building? It had a set of 462624 heads on it and I was wondering how big of a cam I can use without changing the springs and studs at this moment to get his truck cruising down the road I got a good deal on a crane energy cam with a 454 lift will this work with these stock heads I know they are not good heads and prone to cracking but would they last at all til he can buy some better ones

[whyholdback]

Nothing wrong with those blocks for 400 HP / 6000 RPM.
All 624 heads are suspect, regardless of valve sizes. That cam you found is a mis-match for every version of the 624s. It's single-pattern, which would be fine for the 1.72"-intake-valve-version, except the cam starts working just before the heads are all done. Choose something shorter. If your 624s have 1.94" or 2.02" ( L82 'vette ) intake valves, then you need a dual-pattern cam. Ideally something like the Speed Pro CS1151R, or Comp's DualEnergy 255. If you're not sure what valves are in the heads, then assume 1.94".

[Dannylmcguire]

ok good deal on the block I figured it would be fine just thought I would check up on it an d on the heads what would be a good set to put on there to work with that cam I work for a company that has a salvage yard so I have quite a few options out there I am wanting to stay away from vortecs also due to the fact I already have valve covers and a manifold so if you have any good ideas I would sure appreciate it thank you