Difference in SC Heads VS Carrera Heads

[Akila]

So I had a set of SC heads that may not be coming back to me...... A story involved... I was looking at the valve sizes & port sizes of the SC heads & the Carrera heads. The Carrera heads have just a touch more intake & exhaust port sizes than the SC Heads. Is there any other difference in comparison?

[WERK I]

Originally Posted by Akila

................................ The Carrera heads have just a touch more intake & exhaust port sizes than the SC Heads. Is there any other difference in comparison?

Correct. The 3.2 heads breathe better than the SC heads by a small margin.

The intake and exhaust port studs different. The 3.2 heads got a reputation of poor valve guide life. Deserved or not, seriously consider having guides replaced if their status is an unknown.

[philip j]

Is this a good upgrade with sc cams for our motors? Thinking of collecting parts for a top end rebuild. thanks Philip

[WERK I]

IMHO, yes. It's going to require some port matching on the CIS intake manifold/injector blocks and judging from other posts on this site, it is not an easy process. You could go with CNC machined aluminum blocks available from a number of shops. On the other side of things, the exhaust ports should be matched with another style of header. Larger header primaries are in order for the 3.2 heads.

[spence88mph]

Or... might be the right time to go EFI!

[Akila]

If anyone has interest in some Turbo Kraft injector blocks that have been slightly bored to match SC heads, keeping the CIS. I have a set that I will be sellling. I will be going EFI. Thanks for the responses!