I have 454's rebuilt with the weiland blowers I think 177's engines orignally were suppose to run at 34 degrees full advance
engine builder set them at 30 (he doesn't want it to detonate and deal with warranty lol...) any opions if I run it to 34? I am running
8.4 to 1 comp with 5 lbs boost. stock crank & rods. I am looking for more top speed... heavy formula 336sr1 bravo xr drives
with 26 pitch 4 blade merc prop...74mph on gps 5200 wot

Don't do it, the gains are not worth it, I would not run more then 28-30 total.... the power gains from a few degrees are not gonna be much, but melting a piston will cost ya, blowers and lots of timing not a good idea...

Running too little timing creates more heat and raises EGT's. If the builder said 30* then I'd prob keep them there or maybe bump them to 32* total.

i hope you have inconal exhaust valves.

28 degrees is not too little..... 28-30 is "safe"

and yes, better have Inconel.....

I would agree to leave it at 30. With today's fuels you need all the safety you can get.

28-30 is fine have tested and found no + to go over 30...

I completley disagree that a few degrees of timing will not make a difference. Timing is EVERYTHING in boosted applications. But, if you do not know how to read a plug just leave it at 30*.

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true... But higher timing will detonate faster then lower.... Lower timing will also bring egt down a little supposedly... But yes too little timing will blow chit up too but I say a little low is way better then a little high!!!

alum or iron heads?