I'm doing a gsr rebuild, GSR crank, Eagle rods, bore over, 81.50 CP 12.5:1, Blox A's, type r manifold. Gonna run a 0.045" headgasket to bring the compression down to 11.9, it's gonna be on 91 octane. Looking to make 220ish and still be streetable. Trying to leave some headrooom for later, when the car will be less of a streetcar. At that point I can replace the headgasket with a thinner one, and do some headwork. Looking for any new ideas or critiques, all are welcome.

 

I'd leave it at 12.5:1 compression and go with blox C's. 220 will come easy. See how far you can push 91 Oct.

 

i do not think that blox As will support that kind of HP with 1800ish ccs. by blox C i think he meant blox HSL and i would second that notion.

why 81.5? leaving room for another rebuild? you can do 82.

look to CCcylinder heads for headwork. he is local to you.

 

Kinda scared to go that high, 12.2 would be optional, but I'll settle for 11.9. I'm not sure exactly what cams are in it, it's actually a customer's motor. I'm gonna take some measurements tomorrow.

 

Headwork isn't really in his budget for right now, its a fresh portflow valve job.

 

Tony I definitely wouldn't do the Type A's.

They are a pretty basic cam. With that compression i would look into the Bs or even better the HSLs if your customer is on a budget. I think skunk pro1s would be ideal, but it all boils down to what the customer wants to spend haha.

Definitely leave it at 81.5 though.

What header and throttle body are they using ?

 

in that case man, just build it with what he gives you, properly, and make no promises on power output.

 

I'm not really sure what cams are in it, all he remembers is that they're Blox. I'm gonna mic them tomorrow. Hopefully they are B's, I did a motor a few years back with them and it did very well. It's on a Jasma 4-1 stock t.b. for now but looking for a 70 and matchport the I.M.

 

jasma is just japanese emissions. its the equivalent of a dc sports 4-2-1. just a simple, emissions passing header. there is NO WAY it will make 220hp with that header and blox As. more like 175. like i said.... just put it together properly and dont worry about numbers. sounds to me like as long as it puts the kid into the seat a little he will be happy.

 

I've always been of the opinion to go 81.5, in which case you at least have .020" to work with in the future. I also agree anything in the DD/mild street should stay below 12.0 esp. on 91. Little more cam would be nice though.

 

I believe they are Blox B's, he's gonna grab the boxes they came in to double check. He remembers that they were skunk 2 copies.

 

Maybe leave the clearances a little loose say 0.0018" on the mains and rods. Maybe leave about 1/2 thou of additional ring gap and 1/4" additional gap on PW.

Given that this a GSR head, you can probably get away with running a OEM one.

Has the manifold been ported? because that can make for some nice gains.

220whp on a 1.8L using 91 is going to be a challenge.

 

81.5 is safer to run than 82 .. that is pushing the limit to cracked sleeves

 

Bad news, just found out they're Blox A's. How much will these effect compression as opposed to some blox B's. Also do Blox B's require aftermarket valve train?

 

Bad news not really, I run the Blox As with 11.5 81.5 mm. The car makes ~200 whp and runs 12s on 22"s.

Yes, Blox Bs require aftermarket VT.

 

Nice, thats good news.