Im building a 355(eventually) but Ive got a 305tpi now. I bought a set of vortec 906 heads and a set of 113 vette heads. I know the 113 will work on the 305 with no milling and the vortecs will have to be milled down for my cr. If I keep the 113s and sell the vortecs will I regret it once the 355 is ready..Ive been searching and I dont see alot of comparison threads on the 2 heads.whats your take? Also the 113 have dual coil springs on them, is that stock? If so and I machine them for higher lift will that spring be good to .520. thanks

 

you would be better off with the vortecs since they flow alot better than the 113's unless you want to have the 113's ported n pollished and machined but you would need the vortecs to have the valve guide bosses machined along with different valve seals for the amount of lift you want. you also should make sure the valve springs match what the cam company recommends for spring pressures,valve spring diameter,and coil bind. if the 113s already have dual valve springs then there must have been some work done to them since they only come with a single valve spring with a dampner inside the spring. here is a ling to certain cylinder head flow numbers the 113's are the l98 heads

http://purplesagetradingpost.com/sum...%20L98%20Vette

i hope this help you a little bit

 

thanks, thats probaly a damper coil in the spring..I was told there stock..Ill double check. thanks for the chart.

 

no problem......how much did you pay for both sets of heads if i may ask?

 

I just bought the 113s today for $375 @ 90k and the vortecs I bought @ 2months ago rebuilt a little less than 4k ago valves,springs,seals,retainers as an entire 350 with a piston slap for $275 but I had to drive like 2 hours each way,then i preped and painted them.

 

ahh i see , you still have the 350 that they came from? if so im looking for a set of hyd roller lifts for that year block

 

this is the link the vortecs are in with some more pics...Im tryin to sell em for $400 now that I have the 113s https://www.thirdgen.org/forums/engi...tec-heads.html just such a pain in the %#$ ship cause the weight I think there worth $400 but the shipping would prob be $50 and thats too much..damned if you do damned if ya dont..oh well
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I thought they were all the same lifters as long as its from a first gen block..non lt1...I was going to use those in my build..but I tell ya what when Im pulling out my 305 tpi Ill send ya those roller lifters for $20 plus shipping

 

The 113's have Screw-in studs and guideplates. I would just send to Lloyd Elloit for a port job. I would opt for the LE2 package. Those would ROCK!

 

All GMs aluminum small block heads have screw-in studs, and lots came with guideplates too. The L98s are no exception. My LT1 has screw in studs too. No aluminum heads had pressed studs, only iron.