Hi All, any one that races I am building a 240z to race in vintage class, I was lucky to get a stage 5 according to msa chart but its the scnheider 300f good for 4-8,250k rpm and all the goodies, what head with porting/valve change will give me the best performance i have every model the e31 early 71-72 e88 and the 73-74e88 since i scored on the camshaft i can throw a few more dollars at a head job,I also scored by trading my room mate for a new set of 44 mikunis never run so thats what will be fueling this set up

Thanks for any input, from what ive read, so much to read,the e31 or early e88 sounds good but i'd like some real world input or ideas

I would suggest buying How to Modify Your Nissan/Datsun OHC Engine by Honsowentz and reading all the sticky threads in the Hybrid Z L6 forum here: http://forums.hybridz.org/index.php/forum/32-nissan-l6-forum/ If you're searching here pay attention to what Phred says too. Lots of info, but you have to find and read it.

thanks jon have it, I just wanted some real world input from people who have used both the e31 and early e88 to race 240s

Check zredbaron's threads on Hybrid Z. They're in the stickies.

I have raced with both E31 and E88. Once fully modified for a race engine there is no difference in the two IMO. If you are going to be racing in CP with a 2400cc engine be careful about trying to go too big on the valves as shrouding by the cylinder may cause more problems than advantages of the big valves.

Mike