i have a freind that owns a machine shop that have some n351 cylinder heads that he saids i can get for 200 dollars,he builds a lot of circle track car motors. all the heads have some work done to them alreadly.i have two motor 302 thats runnning and a 351w that is tow down,my question is how good are these heads and do you think i can get 450 to 500hp with them on 1 of this motors and steal run pump gas.my plan was to go with afr185s on my 302. they said they got 455hp with there combo on the dyno.
The question is how built up is the bottom half of the engine? Because the top half is the breathing part that has to get rid of the exhaust. The 351w heads have water jackets in a differant location so you'll have to drill some holes in the head. With the right valves you can make engine get more horses no dout. Have fun with the project.
n351 cylinder heads question so you are saiding the water jackets on the n351 heads are not the same on the 302 and 351w block or just 1 of them.
Windsor heads will interchange on windsor blocks.(no difference in the coolant passages on the deck) Cleveland heads on a windsor block require a few coolant passage mods to make em work on the afore mentioned windsor block. 351 windsor heads use 1/2" dia. head bolts. All other windsors use 7/16" head bolts. You will need special stepped head bolts to use the 351W heads on a 302 block.
N heads are good heads but the valve angle is different than regular Windsor & 302 heads. Valve reliefs will have to be flycut in the piston more than likely. They have excellent chambers and they'll make some serious HP...but...they aren't a 100% bolt-on. They're race heads designed for circle track engines. If you can get them for $200 and they're not hurt, get them, then re-sell them for a profit & use the profits to get a set of 20° heads...like the AFR's. Stock valve angles are 20°. N heads are 10° If I remember right-and correct me if I'm wrong please.
Thanks for correcting my mistake , i just looked up my interchange book and found that i gave the wrong info on that intercharge . Sorry guy,s and ladies. James
n351 cylinder heads question thanks you for that imformation,so i can use the n351 heads on a 302.would a flat top 302 piston work.and if the heads has been worked do i have to go up on the compression to make them work,i'm trying to keep the car streetable-pump gas-but i still would like to make at least 450hp.the reason i ask is because the 302 is running and the windsor is really just the block and i will have to buy crank,rods and piston but to get what i'm look for as for hp. i will buy them.
http://www.tmeyerinc.com/ Talk to them or if you use them heads he has a deal on the intake rockers. Tell them dave stuckey referred you. They can set you up with parts and ideas for what you want.
n351 cylinder heads question thanks again guys,i just went and pick up the heads,steve my freind that own the machine saids these heads have been ported and polish vaules worked the whole 9 yards have been done to them.he saids they will be good up to 408ci on a pump gas motor.so i have made my mind up and i'm going to build the windsor and stroke it to 393ci.so i need your help with a good cam that will help me get the number i'm looking for-450 to 500hp.it doesn't matter if it hyd.hyd.roller,or soild roller,and a good intake and carb.
Talked to my buddy, don't forget this is a drag only car, his cam is a bullet and bout the only thing he remembered was mech. roller, 630 lift. or near about. Runs racing gas. Be awhile till I get to his place and get stroker kit # and see cam card. The n351 heads were worked over, motorsport intake, 850carb, timing locked at 30` Who's going to build this? 450 horses is a lot of HP for the street, whole bunches if your picking up groceries with it! If your buddy with heads is building, he got some good ideas on what to build. Call a couple of cam makers tech line, run what you want outta your engine and let them offer choices. Cam an Compression work together, with the right cam you can push the compression and still run pump gas.
n351 cylinder heads question THANKS,dkstuck for the the imformance but i'm the one building the engine.i've been out of the game sence about 1993-94 so i need all the imformance i can get.when i had the car then it had a 351c,c6 and 430's gears and it ran 11.80s with 10.1 compression and 100 shot of nos.so now i'll like to put a 351w stroker with a c4 and the same 430's and see if i can do a little better went i do run the car.so thanks AGAIN
